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Determination of phosphorus in silicate rocks by flow injection method of analysis

Bestimmung des Phosphors in Silikatgestein durch Flieβ-Injektions-Analyse

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Summary

A flow injection spectrophotometric method has been developed for the determination of phosphorus in silicate rocks. A rock solution is prepared by fusion with a mixture of lithium carbonate and boric acid and subsequent dissolution with l M hydrochloric acid. An aliquot of the sample solution is injected directly into the flow system, which consists of formation of heteropolyacids of molybdenum and antimony, reduction with ascorbic acid, and subsequent measurement of the absorbance of blue species. It permits semi-automated analysis of a variety of silicate rocks for phosphorus. Results obtained for standard rocks were in good agreement with the recommended values. The throughput comes out 20 samples per h.

Zusammenfassung

Ein Verfahren zur spektrophotometrischen Phosphorbestimmung in Silikatgestein mittels Fließinjektion wurde entwickelt. Das Gestein wird mit einer Mischung aus Lithiumcarbonat und Borsäure aufgeschlossen und in 1 M Salzsäure gelöst. Ein aliquoter Teil der Lösung wird unmittelbar in das fließende System injiziert, worin Heteropolysäuren aus Molybdän und Antimon gebildet, mit Askorbinsäure reduziert und die Absorbanz der blauen Farbe gemessen wird. Dies ermöglicht die halbautomatische Analyse verschiedener Silikatgesteine zur Phosphorbestimmung. Die Resultate von Standardproben stimmen mit den vorgeschriebenen Werten gut überein. In der Stunde können 20 Proben durchgesetzt werden.

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Authors and Affiliations

  1. Laboratory for Analytical Chemistry, Faculty of Engineering, University of Chiba, Yayoi-cho, Chiba, Japan

    Rokuro Kuroda, Iwao Ida & Koichi Oguma

Authors
  1. Rokuro Kuroda
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  2. Iwao Ida
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  3. Koichi Oguma
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Kuroda, R., Ida, I. & Oguma, K. Determination of phosphorus in silicate rocks by flow injection method of analysis. Mikrochim Acta 82, 377–383 (1984). https://doi.org/10.1007/BF01198683

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  • DOI: https://doi.org/10.1007/BF01198683

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